Window-lock



W. MADISON. WINDOW LOOK.

(No Model.)

No. 559,982. Patented May 12, 1896.

AN DREW B GRAHAMv FHUTOUWQWASNINGTON. D C

UNTTEn STATES PATENT UFFTCE.

\VILL AM MADISON, OF LOS GATOS, CALIFORNIA.

WINDOW-LOCK.

SPECIFICATION forming part of Letters Patent No. 559,982, dated May 12, 1896. Application filed January 24, 1896. Serial No. 576,676. (No model.)

To aZ-Z whom it may concern.-

Be it known that I, WILLIAM hlADISON, a citizen of the United States, residing at Los Gatos, county of Santa Clara, State of Cali fornia, have invented an Improvement in lVindow-Locks and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to an improved device forlocking the sashes of windows to limit the amount of opening or altogether prevent their being opened.

It consists in details of construction which will be more fully explained by reference to the accompanying drawings.

Figure l is a general view showing the ar rangement of my device. Fig. 2 is a view of the interior of the lock, the face-plate being taken off. Fig. 3 is a section through the lock, taken in line with the locking-bolt. Fig. a is a detail of a portion of the case, showing its sleeve or collar having a segmental channel E.

A and B are the two sashes of a window, slidable in vertical grooves or channels made in the casing in the usual manner. Upon the top of the sash A, at a point near one side, is secured the lock-case 0. Through the upperpartof this lock-case a bolt, stem, or shank D extends from front to rear. Upon the front end of this bolt is a knob by which it may be readily turned with the fingers. A cylindrical sleeve or collar a is fixed to the front of the case, so that the stem passes through it, and this sleeve has aslot or channel E made in the interior and forming a segment of about quarter of the circumference of the sleeve. A pin F projects from the stem D so as to enter this segmental channel or groove, and it serves to limit the distance to which the stem can be turned. Upon the inner end of the stem is a cross-bar G, the ends or" which project a little upon each side of the stem, thus forming a sort of T-head. This T- head is adapted to enter correspondingly-shaped sockets H, which are fixed upon the upper sash at any suitable or desired points above the lock. A spring I surrounds the stem or shank D and normally forces it outward, so that the T-head G remains disengaged from the socket-plates H, and is sufficiently withdrawn from the upper sash to allow the lower portion to slide up and down freely without any contact of these parts.

When it is desired to lock the sash, the T- head is brought into line with the slots in the plate H, and the stem or shank is then pushed inwardly until the T- head has entered the slot of the locking-plate where it is to be secured. The shank is then turned a quarter of a revolution, which brings the T- head in a position at right angles with the slots through which it was entered, and this prevents its be ing withdrawn. In this position the lower and upper sashes are locked together, and one cannot be moved without the other.

In order to render this look secure and prevent its being turned and withdrawn, I have shown a further means for permanently locking it. This consists of a Vertically-sliding plate J, fitted within the casing O, and having in the central portion of it a rectangular channel K. The shank or stemD has formed or fixed upon a portion of it the rectangular enlargement L, which is of such diameter that when it is in line with the channel K in the plate J the plate can be moved upwardly, so that the enlargement L will be inclosed in the channel K, in which it just fits. This will prevent the shaft D from being turned, and as the engagement takes place when the shaft has been pushed inwardly and the T- head engaged with the locking-plate H of the other sash it will be manifest that by moving the plate J upwardly it will be impossible to disengage the locking-bolt from its engagement with the plate H. This movement of the plate J is produced by any suitable key M, which fits upon a central key-post and is turnable in a suitably-shaped irregular opening or ward formed at the lower part of the channel K.

In order to prevent the plate J from being easily moved downward, so as to disengage it from the rectangular part L of the shaft, I have shown a spring-actuated pawlN pivoted within the case and a projecting pin or stud 0 upon the plate J, which, sliding upward with the plate when the latter is raised, finally arrives at a point where a notch in the pawl will drop below and engage this pin or stud, thus making it impossible to depress the plate J by any device except a key which will simultaneously press the pawl N back. This is done whenever the key is introduced and turned to unlock the device, because the wards of the key turning to one side will force the pawl back, so as to disengage it from the lug or stop before the key commences to act to press the plate J down. After this disengagement the plate is easily pressed down until the slot K is below the rectangular portion L of the shaft, when the shaft can again be turned to disengage the T-head G and allow the shaft to be withdrawn from the locking-plate II. This device can be employed when it is desired to lower the upper sash for ventilating purposes, and there may be as many of the locking-plates ll along the face of the sash as it is desired to have differentsized openings. In order to at the same time lock the lower sash and prevent its being moved, I have shown a bolt 1 passing transversely through the lower part of the case 0, having a spring surrounding it by which it is normally pressed toward the window-casing. In this casing is made a hole or socket Q at the point where it is desired to lock the sash, and when the pin stands opposite this hole it may be forced into it by the spring, and thus prevent any vertical movement of either of the sashes, the two being locked to gether. IVhen it is desired to release this pin, it is simply withdrawn and then turned a quarter of a revolution. Upon the end of a pin is a lug or projection I", which when the pin is turned as just stated will engage the side of the lock-case C, and thus hold the pin drawn back, so that it will not engage the opening Q in the casing. This leaves the sash and lock free to be moved up and down as long as this pin remains disengaged and as long as the two sashes are not locked together. lVhenever this pin has been turned and allowed to enter the'hole in the casing, so as to lock the sash to the casing, it may it self be locked so that it cannot be turned by forming the bottom of the plate J so as to engage the pin P when the plate has been raised by the turning of the key, and thus lock this pin simultaneously with the locking of the pin or stem D which secures the sashes together. In this way the whole device may be permanently and rigidly secured either closed or partially open. vVhen thus locked, the two sashes act as a brace to resistany force which may be applied to raise the lower sash, and any settling of the sashes is entirely prevented.

Having thus. described my invention, what I claim as new, and desire tovsecu re by Letters Patent, is

1. The combination with vertically independently sliding window-sashes of a casing fixed to the top of the lower sash, slotted socketpieces fixed to the upper sash in the line of travel of the casing, a spring-actuated bolt extending through the casing having a T-head formed upon its inner end adapted to enter the slots of the sockets on the upper sash, said bolt being revoluble so as to lock the T-head within the socket-pieces, a plate slidable vertically within the casing and a key by which it may be moved, a rectangular channel formed in the plate, and a correspondingly-shaped enlargement upon the bolt which coincides with the channel in the plate when the bolt has been pushed in, so as to lock the two sashes together and so that the plate can be moved up to engage the enlargement of the bolt to prevent its being turned.

2. The combination with independentlymova-ble sashes of a case secured to the top of the lower sash, having asleeve or collar at its front provided with a segmental slotor channel, sockets fixed to the upper sash in the line of travel of the case, a bolt movable through the case having a locking-head upon the inner end adapted to engage corresponding slots in the plates of the opposing sash and turnable to lock within said slots, said bolt having, also, a pin to engage said seg mental slot or channel, a vertically-sliding plate with a rectangular channel and a correspondingly-shaped enlargement upon the belt which is engaged by the channel when the plate is moved upwardly, a lug or stop upon the plate and a spring-pawl adapted to engage it when the plate has been raised to lock the bolt, and a key whereby the plate is raised or depressed and the spring-pawl is forced out of engagement to allow the plate to be depressed when the device is to be unlocked.

3. The combination with vertically-slidin g window-sashes of a lock consisting of a casing secured to the top of the lower sash, slotted plates fixed to the upper sash, a bolt movable forward and back through the casing having a locking-head on the inner end adapted to engage the slots in the casing, a mechanism comprising a vertically-movable slot-ted pl ate having a stop and a vertically-disposed latorally-swinging pawl to engage said stop whereby the head is locked and secured in its engagement and a transversely-slidable bolt passing through the locking-case and adapted to engage the side of the windowcasing tov prevent movement of either of the sashes.

In witness wllereofl have hereunto set my hand.

WILLIAM MADISON.

IVitnesses:

S. H. Nounsn, Jnssin C. BRODIE.

IIO 

